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marqs_ic's avatar
marqs_ic
Icon for New Contributor rankNew Contributor
4 years ago
Solved

Clocked Video Input II vid_datavalid width is 1 regardless of pixels in parallel parameter

Hi, I'm feeding oversampled video into CVI II IP and trying to make it only read every Nth pixel. There seems to be vid_datavalid signal for exactly this purpose, but its width does not get expand...
  • ZH_Intel's avatar
    ZH_Intel
    3 years ago

    Hi marqs_ic,

    Good day.

    Thank you for your input.

    Will convey it to our internal team on this.

    Do you still have further inquiries on this issue?

    If there is no further question, I will transition this thread to community support.

    Thank you.

    Best Regards,

    ZulsyafiqH_Intel

ZH_Intel's avatar
ZH_Intel
Icon for Frequent Contributor rankFrequent Contributor
4 years ago

Hi marqs_ic,

Apologize for the delayed response.

May I confirm that the video format you are using is of embedded synchronization or separate synchronization?

Based on the Video and Image Processing Suite User Guide, vid_de is for separate synchronization mode only.

You may refer below link for more information:

Video and Image Processing Suite User Guide - 7.11.1. Clocked Video Input II Interface Signals

Thank you for your patience.

Best Regards,

ZulsyafiqH_Intel

marqs_ic's avatar
marqs_ic
Icon for New Contributor rankNew Contributor
4 years ago

Yes, I'm using separate synchronization mode.

For now I managed to work around the issue by using a FIFO to store valid samples and reading N samples at once (equivalent to pixels in parallel). When there are are less than N samples in FIFO, read is not done and VIP vid_datavalid bit is deasserted for that cycle. It would be still good if vid_datavalid width matched "pixels in parallel" which feels like how the IP is supposed to work.